linux-kernel - Re: [PATCH v2 -next] cgroup: remove offline draining in root destruction to avoid hung

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Message-ID: <4fdf0c5b-54ce-474a-a2c7-8b99322ff30e@huaweicloud.com>
Date: Thu, 31 Jul 2025 19:53:02 +0800
From: Chen Ridong <chenridong@...weicloud.com>
To: Michal Koutný <mkoutny@...e.com>
Cc: tj@...nel.org, hannes@...xchg.org, lizefan@...wei.com,
 cgroups@...r.kernel.org, linux-kernel@...r.kernel.org, lujialin4@...wei.com,
 chenridong@...wei.com, gaoyingjie@...ontech.com
Subject: Re: [PATCH v2 -next] cgroup: remove offline draining in root
 destruction to avoid hung_tasks


> I acknowledge the issue (although rare in real world). Some entity will
> always have to wait of the offlining. It may be OK in cgroup_kill_sb
> (ideally, if this was bound to process context of umount caller, not
> sure if that's how kill_sb works).
> I slightly dislike the form of an empty lock/unlock -- which makes me
> wonder if this is the best solution.
> 
> Let me think more about this...
> 
> Thanks,
> Michal

Hi Michal,

Have you come up with a better solution for this?
Would appreciate your thoughts when you have time.

Best regards,
Ridong